Mendelian Genetics

Biology I

Mr. Nettles

Today’s Agenda – Wed. Nov. 16, Today’s Agenda – Wed. Nov. 16,

20112011

Warm-up (Who is Gregor Mendel?)

Vocabulary Find

Any remaining time will be dedicated to A-Plus

Today’s ObjectiveToday’s Objective

I will explore the life of Gregor Mendel.

I will define 16 key vocabulary term related to Mendelian Genetics.

Warm-Up (Nov. 16)Warm-Up (Nov. 16)

Use an Internet Browser (Yahoo or Google) to search “Gregor Mendel.”

Take about 10 minutes to read about his life.

Take about 5 minutes to write three to five sentences about his life.

Share your findings with the class.

A. adenine and cytosine B. cytosine and thymineC. thymine and guanineD. cytosine and guanine

Which of the following shows the correct pairing of DNA bases?

Cellular Energy

Warm-Up (Nov. 14)

Today’s Agenda – Mon. Nov. 21, Today’s Agenda – Mon. Nov. 21,

20112011

Warm-up (EOC Practice Problems)

Genetics: Alleles, Monohybrid Crosses, Punnett Squares

Example Simple Genetics Problems

Mendelian Genetics

Biology I

Mr. Nettles

Today’s ObjectivesToday’s Objectives

I will explore the use of Punnett Squares to solve simple genetics problems.

I will understand the difference between homozygous and heterozygous.

I will understand the difference between genotype and phenotype.

I will understand the difference between dominant and recessive.

Warm-Up (Nov. 21)Warm-Up (Nov. 21)

Warm-Up (Nov. 21)Warm-Up (Nov. 21)

Warm-Up (Nov. 21)Warm-Up (Nov. 21)

Warm-Up (Nov. 21)Warm-Up (Nov. 21)

Warm-Up (Nov. 21)Warm-Up (Nov. 21)

AllelesAlleles

Alleles are different forms of genes.

Homozygous – both alleles are the same

Heterozygous – both alleles are different

Dominant vs. Dominant vs. RecessiveRecessive

Dominant Allele – the expressed trait it’s the trait that you see usually represented by a capital letter

Recessive Allele – the masked trait it’s the trait that’s covered up when a

dominant allele is present usually represented by a lowercase letter

Dominant vs. Dominant vs. RecessiveRecessive

In Mendel’s pea plant experiment green was dominant over yellow. G = green (dominant) g = yellow (recessive)

The Alleles for Pea Plant Color GG = homozygous green Gg = heterozygous green gg = homozygous yellow

Monohybrid CrossMonohybrid Cross

A monohybrid cross is the study of one trait only. Mendel used monohybrid crosses to study

pea plant color and form separately.

Punnett SquaresPunnett Squares

Punnett Squares show possible combinations of alleles from genetic crosses.

Punnett SquaresPunnett Squares

Phenotypes – physical characteristics 3 purple flowers 1 white flower

Genotypes – genetic makeup 1 PP (homozygous purple) 2 Pp (heterozygous purple) 1 pp (homozygous white)

Pp x Pp

Quiz Tomorrow!!Quiz Tomorrow!!

Study Vocabulary Words from last week!!

Work example problems from handout!! (Hint, Hint)

Ask Mr. Nettles for help on the problems you don’t understand well!!